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KVM: x86: Add a framework for supporting MSR-based features

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Provide a new KVM capability that allows bits within MSRs to be recognized
as features.  Two new ioctls are added to the /dev/kvm ioctl routine to
retrieve the list of these MSRs and then retrieve their values. A kvm_x86_ops
callback is used to determine support for the listed MSR-based features.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[Tweaked documentation. - Radim]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Tom Lendacky
2018-02-21 13:39:51 -06:00
committed by Radim Krčmář
parent d4858aaf6b
commit 801e459a6f
6 changed files with 114 additions and 17 deletions
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2
include/uapi/linux/kvm.h
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@@ -761,6 +761,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_TRACE_PAUSE __KVM_DEPRECATED_MAIN_0x07
#define KVM_TRACE_DISABLE __KVM_DEPRECATED_MAIN_0x08
#define KVM_GET_EMULATED_CPUID _IOWR(KVMIO, 0x09, struct kvm_cpuid2)
#define KVM_GET_MSR_FEATURE_INDEX_LIST _IOWR(KVMIO, 0x0a, struct kvm_msr_list)
/*
* Extension capability list.
@@ -934,6 +935,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_S390_AIS_MIGRATION 150
#define KVM_CAP_PPC_GET_CPU_CHAR 151
#define KVM_CAP_S390_BPB 152
#define KVM_CAP_GET_MSR_FEATURES 153
#ifdef KVM_CAP_IRQ_ROUTING